Creepy Wranglers

In nightmare rift there is something called a creepy wrangler, like the one you see in this picture above on the right thats in geen type of color. To use click on it, then you will see a close up of it and your curser will turn into a net, and it will say to cast in by clicking. Try to catch a critter on the head, and if you do it right, you got yourself a pet!